SRF2017 - List of Keywords (quadrupole)

Paper	Title	Other Keywords	Page
MOYA03	Progress of the RAON	ion, cavity, cryomodule, rfq	36
	D. Jeon, B.H. Choi, C. Choi, J.W. Choi, C.O. Choi, S. Choi, I. Chun, I.S. Hong, M.O. Hyun, H. Jang, H.M. Jang, J.-H. Jang, S.C. Jeong, H. Jin, Y.W. Jo, J. Joo, M.J. Joung, H.C. Jung, I.I. Jung, Y. Jung, J. Kang, D.G. Kim, H. Kim, H.J. Kim, J.H. Kim, J.-W. Kim, W.K. Kim, Y. Kim, Y.K. Kwon, D.Y. Lee, J. Lee, K.W. Lee, M. Lee, S. Lee, S. Lee, S.H. Nam, B.-S. Park, M.J. Park, K.T. Seol, I. Shin, J.H. Shin, C.W. Son, K.T. Son, S.W. Yoon, A. Zaghloul IBS, Daejeon, Republic of Korea
	Funding: This work was supported by the Institute for Basic Science funded by the Ministry of Science, ICT and Future Planning (MSIP) and the National Research Foundation (NRF) under Contract 2013M7A1A1075764 Construction of the RAON heavy ion accelerator facility is in-progress in Korea. The driver linac is a superconducting linac with 200 MeV/u for uranium beam and 400 kW beam power. Prototyping of major components and their tests are proceeding including superconducting cavities, superconducting magnets and cryomodules. December 2016, the RFQ accelerated oxygen beam. Status report of the RAON accelerator systems is presented.
	Slides MOYA03 [10.275 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOYA03
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MOPB004	Design of a RF Quadrupole Resonator for Landau Damping in HL-LHC	ion, cavity, impedance, damping	51
	K. Papke, A. Grudiev CERN, Geneva, Switzerland
	The design and optimization of a quadrupole resonator for transverse Landau damping in the High Luminosity Large Hadron Collider (HL-LHC) is presented. Two different cavity types are considered whose shape is determined by quadrupolar strength, surface peak fields, and beam coupling impedance. The lower order and higher order mode (LOM and HOM) spectra of the optimized cavities are investigated and different approaches for their damping are proposed. Along an example, the required RF power and optimal external quality factor for the input coupler is derived.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB004
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TUPB016	Redesign of CERN's Quadrupole Resonator for Testing of Superconducting Samples	ion, cavity, alignment, simulation	420
	V. del Pozo Romano, R. Betemps, F. Gerigk, R. Illan Fiastre, T. Mikkola CERN, Geneva, Switzerland
	The Quadrupole Resonator (QPR) was constructed in 1997 to measure the surface resistance of niobium samples at 400 MHz, the technology and RF frequency chosen for the LHC. It allows measurement of the RF properties of superconducting films deposited on disk-shaped metallic substrates. The samples are used to study different coatings which is much faster than the coating, stripping and re-coating of sample cavities. An electromagnetic and mechanical re-design of the existing QPR has been done with the goal of doubling the magnetic peak fields on the samples. Electromagnetic simulations were carried out on a completely parameterized model, using the actual CERN's QPR as baseline and modifying its dimensions. The aim was to optimize the measurement range and resolution by increasing the ratio between the magnetic peak fields on the sample and in the cavity. Increasing the average magnetic field on the sample leads to a more homogenous field distribution over the sample, which in turn gives a better resolution. Some of the modifications were based on the work already done by Helmholtz-Zentrum-Berlin for their upgraded version of the QPR.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB016
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TUPB052	Higher Order Modes Damping in 9-cell Superconducting Cavity with Grooved Beam Pipe	HOM, cavity, ion, damping	502
	A.M. Bulygin, R.V. Donetskiy, Ya.V. Shashkov MEPhI, Moscow, Russia
	This paper is focused on higher order modes (HOM) damping efficiency analysis in 9-cell superconducting cavities with HOM couplers and with grooved beam pipe. Comparison of two methods of HOM damping is presented. In order to increase efficiency of damping of trapped modes the end cells of the structure were modified. Higher order modes, tesla, SRF
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB052
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THPB053	Surface Resistance Characterization of Nb3Sn Using the HZB Quadrupole Resonator	ion, SRF, cavity, niobium	863
	S. Keckert, J. Knobloch, O. Kugeler HZB, Berlin, Germany D.L. Hall, M. Liepe Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: This work is part of EuCARD-2, partly funded by the European Commission, GA 312453. Nb3Sn is a very promising candidate material for future SRF cavities. With a critical temperature more than twice as the one of bulk niobium, higher operational temperatures with still lower surface resistance are theoretically possible. A sample prepared by Cornell University was characterized towards its SRF properties using the HZB Quadrupole Resonator. In comparison to a coated cavity this device enables SRF measurements at an extended parameter space (frequency, temperature and RF field) and easy access to physical quantities such as critical field and penetration depth. In this contribution we present surface resistance and RF critical field measurements.
	Poster THPB053 [2.725 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB053
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THPB054	Advanced Method to Extract the Surface Resistance From Q0 Measurements	ion, cavity, factory, HOM	867
	R. Kleindienst, S. Keckert, J. Knobloch, O. Kugeler HZB, Berlin, Germany
	Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD-2, grant agreement No. 312453. The quality factor of an RF cavity and the surface resistance are typically related with a constant geometry factor. The implicit assumption made is that the surface resistance is field independent, which is however not observed experimentally in superconducting cavities. The approximation error due to this assumption becomes larger the less homogeneous the magnetic field distribution along the cavity walls is. In this paper we calculate the surface resistance error for different cavity types. An iterative method to correct for this error is presented.
	Poster THPB054 [0.196 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB054
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOYA03

Progress of the RAON

ion, cavity, cryomodule, rfq

36

D. Jeon, B.H. Choi, C. Choi, J.W. Choi, C.O. Choi, S. Choi, I. Chun, I.S. Hong, M.O. Hyun, H. Jang, H.M. Jang, J.-H. Jang, S.C. Jeong, H. Jin, Y.W. Jo, J. Joo, M.J. Joung, H.C. Jung, I.I. Jung, Y. Jung, J. Kang, D.G. Kim, H. Kim, H.J. Kim, J.H. Kim, J.-W. Kim, W.K. Kim, Y. Kim, Y.K. Kwon, D.Y. Lee, J. Lee, K.W. Lee, M. Lee, S. Lee, S. Lee, S.H. Nam, B.-S. Park, M.J. Park, K.T. Seol, I. Shin, J.H. Shin, C.W. Son, K.T. Son, S.W. Yoon, A. Zaghloul
IBS, Daejeon, Republic of Korea

Funding: This work was supported by the Institute for Basic Science funded by the Ministry of Science, ICT and Future Planning (MSIP) and the National Research Foundation (NRF) under Contract 2013M7A1A1075764
Construction of the RAON heavy ion accelerator facility is in-progress in Korea. The driver linac is a superconducting linac with 200 MeV/u for uranium beam and 400 kW beam power. Prototyping of major components and their tests are proceeding including superconducting cavities, superconducting magnets and cryomodules. December 2016, the RFQ accelerated oxygen beam. Status report of the RAON accelerator systems is presented.

Slides MOYA03 [10.275 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOYA03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPB004

Design of a RF Quadrupole Resonator for Landau Damping in HL-LHC

ion, cavity, impedance, damping

51

K. Papke, A. Grudiev
CERN, Geneva, Switzerland

The design and optimization of a quadrupole resonator for transverse Landau damping in the High Luminosity Large Hadron Collider (HL-LHC) is presented. Two different cavity types are considered whose shape is determined by quadrupolar strength, surface peak fields, and beam coupling impedance. The lower order and higher order mode (LOM and HOM) spectra of the optimized cavities are investigated and different approaches for their damping are proposed. Along an example, the required RF power and optimal external quality factor for the input coupler is derived.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB004

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB016

Redesign of CERN's Quadrupole Resonator for Testing of Superconducting Samples

ion, cavity, alignment, simulation

420

V. del Pozo Romano, R. Betemps, F. Gerigk, R. Illan Fiastre, T. Mikkola
CERN, Geneva, Switzerland

The Quadrupole Resonator (QPR) was constructed in 1997 to measure the surface resistance of niobium samples at 400 MHz, the technology and RF frequency chosen for the LHC. It allows measurement of the RF properties of superconducting films deposited on disk-shaped metallic substrates. The samples are used to study different coatings which is much faster than the coating, stripping and re-coating of sample cavities. An electromagnetic and mechanical re-design of the existing QPR has been done with the goal of doubling the magnetic peak fields on the samples. Electromagnetic simulations were carried out on a completely parameterized model, using the actual CERN's QPR as baseline and modifying its dimensions. The aim was to optimize the measurement range and resolution by increasing the ratio between the magnetic peak fields on the sample and in the cavity. Increasing the average magnetic field on the sample leads to a more homogenous field distribution over the sample, which in turn gives a better resolution. Some of the modifications were based on the work already done by Helmholtz-Zentrum-Berlin for their upgraded version of the QPR.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB016

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB052

Higher Order Modes Damping in 9-cell Superconducting Cavity with Grooved Beam Pipe

HOM, cavity, ion, damping

502

A.M. Bulygin, R.V. Donetskiy, Ya.V. Shashkov
MEPhI, Moscow, Russia

This paper is focused on higher order modes (HOM) damping efficiency analysis in 9-cell superconducting cavities with HOM couplers and with grooved beam pipe. Comparison of two methods of HOM damping is presented. In order to increase efficiency of damping of trapped modes the end cells of the structure were modified.
Higher order modes, tesla, SRF

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB052

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPB053

Surface Resistance Characterization of Nb3Sn Using the HZB Quadrupole Resonator

ion, SRF, cavity, niobium

863

S. Keckert, J. Knobloch, O. Kugeler
HZB, Berlin, Germany
D.L. Hall, M. Liepe
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: This work is part of EuCARD-2, partly funded by the European Commission, GA 312453.
Nb3Sn is a very promising candidate material for future SRF cavities. With a critical temperature more than twice as the one of bulk niobium, higher operational temperatures with still lower surface resistance are theoretically possible. A sample prepared by Cornell University was characterized towards its SRF properties using the HZB Quadrupole Resonator. In comparison to a coated cavity this device enables SRF measurements at an extended parameter space (frequency, temperature and RF field) and easy access to physical quantities such as critical field and penetration depth. In this contribution we present surface resistance and RF critical field measurements.

Poster THPB053 [2.725 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB053

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPB054

Advanced Method to Extract the Surface Resistance From Q0 Measurements

ion, cavity, factory, HOM

867

R. Kleindienst, S. Keckert, J. Knobloch, O. Kugeler
HZB, Berlin, Germany

Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD-2, grant agreement No. 312453.
The quality factor of an RF cavity and the surface resistance are typically related with a constant geometry factor. The implicit assumption made is that the surface resistance is field independent, which is however not observed experimentally in superconducting cavities. The approximation error due to this assumption becomes larger the less homogeneous the magnetic field distribution along the cavity walls is. In this paper we calculate the surface resistance error for different cavity types. An iterative method to correct for this error is presented.

Poster THPB054 [0.196 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB054

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)